Taylor Swift sang with Idina Menzel... Complete with Frozen costumes.

If you thought the Frozen pandemonium was dying down... Think again. The movie has been out for almost two years, but the fever for it continues to burn with more fervor. Taylor Swift fueled that fire as she brought Idina Menzel on stage for her Halloween show in Tampa Bay.

Complete with costumes.

Yep, Idina dressed up as the character she voiced, Elsa, and Taylor dressed up as... OLAF! Check this out:

I have to admit. Taylor is the only one I know who would be willing to dress up like this on stage. You wouldn't see many other famous artists going this far for their fans.

She's genius.